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AWWA ACE91062
- Disinfection By-Products Precursor Removal by GAC and Alum Coagulation
- Conference Proceeding by American Water Works Association, 01/01/1991
- Publisher: AWWA
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The purpose of this paper is to present DBP precursor removal results from studies for both coagulation plus sedimentation plus filtration and GAC adsorption. The coagulation plus sedimentation plus filtration results include some data from recently initiated studies designed to determine the effectiveness of increased alum doses, without pH adjustment for optimization of turbidity removal, on DBP precursor removal. The studies initially dealt with trihalomethanes, their precursors, and dissolved organic carbon (DOC), but were expanded to include total organic halogen (TOX), the haloacetic acids (HAAS), haloacetonitriles (HANS), haloketones, chloral hydrate, chloropicrin, aldehydes and their precursors. DBP precursors were measured under two conditions: maximum practical distribution conditions and ambient distribution conditions at the Cincinnati Water Works. An estimate of the precursors based on the maximum conditions is used to evaluate seasonal changes. The ambient simulated distribution was established to represent precursor concentrations that would be converted to DBPs by the end of the distribution system under conditions actually present.
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